fix: resolve all Ruff linting errors

- Fix PLW2901: Use different variable name for stripped lines in loop
- Fix E721: Use 'is' instead of '==' for type comparisons
- Add noqa comments for intentional security warnings (S321, S507, S110, S603)

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

tests/test_upload_google_drive.py

@@ -1,7 +1,7 @@
 """Tests for app/tasks/upload_to_google_drive.py module."""
 
 import json
-from unittest.mock import MagicMock, Mock, mock_open, patch
+from unittest.mock import Mock, patch
 
 import pytest
 from google.auth.exceptions import RefreshError